What is Beef It?
1.
When attempting to perform a critical task, one over does things and fails miserably but also humorously.
To crash and fail
Jim was tryin to jump this car on his bike, but when he hit the ramp he was goin way to fast and just totally beefed it on the other side.
Whoa, did you see that guy? he just totally beefed it
2.
When you play with your dick while looking at a jack mag.
Man I just beefed it for 4 hours straight.